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Tampilkan postingan dengan label Kernel. Tampilkan semua postingan
Tampilkan postingan dengan label Kernel. Tampilkan semua postingan

HIDROCYCLONE (3D)

Posted by Flora Sawita Labels:

Lagi ketagihan gambar 3D, biar aplikasinya mendukung pekerjaan maka yg dijadikan latihan mesin-mesin pabrik.

Saya akan share hidrocyclone yg menggunakan fortex finder yg bisa di "adjust" dan yang fix.

Hidrocyclone pada POM digunakan sebagai pemisah kernel dan shell dengan menggunakan medium air dg memanfaatkan gaya centrifugal. Sedangkan cara yang lain menggunakan Clay Bath (prinsip kerjanya memanfaatkan beda BJ antara kernel dan shell).

1. Hidrocyclone dengan ("adjusting fortex finder")




2. Hidrocyclone dengan ("Fix Fortex finder")


3. Hidrocyclone ("adjusting fortex finder") di modifikasi jadi ("Fix Fortex finder")


Critical Role of Palm Oil in Enhancing Food Security

Posted by Flora Sawita Labels: , , , , , , , , , , , , , , , , , ,

The world population is estimated at 6.8 billion today. This is predicted to increase to 8 billion people in 2030 and 8.9 billion by 2050. There will be many more mouths to feed perpetually in the future thereby increasing the demand for food.
Ever Growing World Population Results in More Mouth to Feed



Over 1 billion, or 15% of the world still do not have enough food on a regular basis. At the turn of this century, United Nations expounded eight Millennium Development Goals. On top of the list is the goal to eradicate extreme poverty and hunger. The need to address this important issue was echoed, not too long ago, at the World Summit on Food Security that was held in Rome, Italy in November 2009. Very recently, in April 2010, World Bank launched the Global Agriculture and Food Security Program (GAFSP), which is a new multi-donor trust fund to improve food security and incomes in low-income countries through assistance to agriculture.

UN Millennium Development Goals



What is food security? According to FAO, food security exists when all people, at all times, have physical and economic access to sufficient, safe and nutritious food to meet their dietary needs and food preferences for an active and healthy life.

The oil palm (Elaeis guineensis) is an important agricultural crop, which yields three important sources of food, namely palm oil, palm kernel oil and palm kernel cake. An average of 3.7 tonnes of palm oil, 0.4 tonnes of palm kernel oil and 0.6 tonnes of palm kernel cake is obtainable from one hectare of land. While the first two products can be used for human consumption, such as cooking oil, margarines, shortenings, bakery fats, vanaspati, ice creams and Vitamin E, etc., palm kernel cake is used as an animal feed.

High Land Productivity of Oil Palm is Key to Mitigate Climate Change



The two major palm oil producers in the world are Indonesia and Malaysia, with outputs of 21.1 and 17.6 million tonnes respectively in 2009. Together, they constitute a magnanimous 85.3% of the world’s production.

World Production in 2009 - 164.5 million tonnes



Palm oil constitutes the major bulk of the world’s production of oils and fats. It contributed to 27.6% share when its production in 2009 was 45.5 million tonnes. Soyabean ranked second with a production of 35.9 million tonnes or 21.8%, animal fats third with 24.4 million tonnes produced or 14.8% while rapeseed was fourth with an output of 21.5 million tonnes or 13.1%.

Palm Oil World Production Share 2009



There are hurdles to overcome during the pursuit to achieve food security in the future. A major obstacle is the diminishing availability of already scarce arable land. While population increases, the lack of arable land may not permit this to happen as it decreases from 0.75 hectares in 1922 to 0.23 hectares in 2005 and this will decrease further to 0.19 hectares per capita in 2030. An urgent need to use this scarce resource wisely can be realized if palm oil is chosen as the preferred oil over the other major vegetable oils. Due to oil palm’s high land productivity, whereby it can produce 4.1 tonnes versus 0.59, 0.42 and 0.36 tonnes of oil per hectare for rapeseed, sunflower and soyabean respectively, 7 times less land area is needed to obtain the same amount of vegetable oil if palm oil substitutes rapeseed completely.

Utilize Minimal Precious Land Resource to Get Same Yield



Similarly, palm oil’s substitution for sunflower and soyabean saves 10 to 11 times more land from being cleared and planted with these two crops. The extra land saved, could then be used to plant other crops or for animal husbandry.

Maximize Use of Land



With land scarcity, palm oil’s contribution to ensure food security comes from successful research carried out in Malaysia, whereby clonal oil palm materials, capable of producing 25 to 50% more fresh fruit bunch yield are already planted in the fields. As such, higher land productivity than that obtained currently, can be expected from oil palm in the future, without resorting to felling more new land.

Vegetable oils such as palm, rapeseed, sunflower and soyabean can be used as biofuels. There is concern that there will be competition between these vegetable oils for use as food or fuel. Chatham House, United Kingdom has optimistically projected that 28% of vegetable oils or 57 million tonnes will be used for biofuels in 2015, with the balance of 72% to be used for food. In 2050, 39% of total vegetable oils will be used as fuel and the balance of 61% will be used for food. Such projected large amounts of vegetable oils dedicated for biofuel usage is unlikely to happen.

Progress has been made to convert biomass to biofuel leading to minimal quantities of vegetable oils being used as biofuels. In this respect, palm oil has a sustainability edge over soya, rapeseed and sunflower, as the oil palm, which is a perennial crop, produces large amounts of biomass all year round and these can be used for biofuel. Palm kernel is already used as a fuel source while palm briquettes can be made from empty fruit bunches. Methane from the palm oil effluent ponds is also trapped and used as biogas. Thus, besides ensuring food security, a new business of converting waste to wealth is created in the palm oil industry.

Palm Biomass Briquettes



Palm oil can enhance food security by ensuring that the competition between food and fuel is minimal when its biomass are utilized for fuel and, therefore, any price hike will not be the result of such competing demands.

One of the drivers that often derail food security is the inability of the rural population, some of which live below the poverty level, to be able to afford sufficient food. The oil palm is a proven economic crop that has been used successfully to eradicate poverty due to its successful cultivation. The FELDA model in Malaysia bears testimony to such a success.

In conclusion, palm oil is the leader among the major vegetable oils that has the greatest potential to overcome food insecurity. It is capable of doing so in a very sustainable way since it requires the least land to produce the same amount of oil, thus freeing diminishing arable land for the cultivation of other crops or for animal husbandry. It is also proven that oil palm cultivation can help to eradicate rural poverty and hunger, which is one of the primary Millennium Development Goals.

Ensuring adequate supply of edible oils for the world market at affordable prices is very important to low income people of the developing world. Derailing future expansion of palm oil production through the Western Environmental NGO anti-palm oil campaigns will impact food security among the developing country population the most. It will also lead to massive deforestation as 10 times more land would be required to plant competing crops such as soyabean to meet future shortages compared to oil palm cultivation.

Pengalaman mengatasi “moisture” kernel tinggi

Posted by Flora Sawita Labels:

Minggu III des 2008 saya melakukan “mill visit” ke salah satu pabrik, group perusahaan tempat saya bekerja. Sejak pabrik beroperasi moisture kernel selalu tidak dapat sesuai standard, sangat berfluktuasi tapi lebih banyak diatas standar. Dimana standar yg ditentukan adala 6.5 – 7.5.
Sebelumnya saya informasikan bahwa Kapasitas pabrik 30 ton/jam , Di stasiun kernel digunakan kernel drying silo sebagai pengering kernel, bukan tray kernel drier. Menggunakan dua silo, masing-masing kapasitas 40 metrik ton. Transfer kernel ke silo menggunakan winnowing fan.
Data fan adalah :
1. Fan size : 270 SWSI
2. Type : L
3. Daya : 20 HP x 4P
4. Putaran fan : 1450 rpm
Pihak pabrik sudah melakukan beberapa perbaikan, diantaranya :
1. Saringan kernel di dihidrocyclone dibuat lebih panjang, dengan tujuan meminimalkan air terikut ke kernel drying silo.
2. Temperatur dinaikkan maksimal (dg membuka valve “fully open”), malah mengakibatkan sebagian kernel hangus.
3. Drying silo dibersihkan rutin setiap 2 bulan
4. Retention time diperpanjang (tapi akibatnya kernel menumpuk akibat kapasitas turun akibat retention time ditambah)
Dari beberapa perbaikan yg dilakukan pihak pabrik belum menghasilkan kualitas yg dinginkan. Bahkan ada usulan utk menambah volume silo dg meninggikan. Padahal secara design kapasitas silo sudah lebih dari cukup walaupun rendemen kernel 6%.
Dasar teori :
Kapasitas kernel drying silo : 40 x 0.6 = 24 Ton ( BJ kernel = 0.6), jadi untuk 2 silo jadi 24 x 2 = 48 ton
Produksi kernel perjam : 35 x 0.06 = 2.1 Ton (asumsi rendemen kernel = 6%, troughput maks = 35 t/jam)).
Asumsi : masing2 silo hanya terisi 75% thd volum silo, Kap. Maksimal = 35 T/jam, rendemen kernel = 6%)
Maka : retention time = 48 x 0.8/2.1 = 17.14 ∞ 17 jam, waktu ini sebenarnya sudah cukup utk mengeringkan kenel.
Setelah sampai di site hal yg pertama saya lakukan adalah mengambil data moisture sebelum masuk ke kernel drying silo. Setelah itu mengukur kuat arus (ampere) fan. Datanya sebagai berikut :

Gambar 1.1 Data analisa moisture kernel

Dari data diatas moisture masuk ke kernel drying silo berkisar rata2 = 17 - 19%. data tersebut OK, karena selisihnya dari LTDS I hanya sekitar 1 – 2 %.
Ada satu hal yg terasa lain, yaitu saat saya merasakan hisapan fan. Hisapannya kecil sekali, dari sana saya coba perhatikan amper motor ternyata hanya 12 A dan 13 A, sangat rendah, untuk fan jenis tersebut diatas amper operasional biasanya sekitar 20A. Berarti bisa disimpulkan CFM fan rendah sehingga tidak mencukupi utk mengeringkan kernel dg kapasitas silo 40T. Setelah mengetahui problemnya saya coba perhatikan arah putaran fan (hasil diskusi dg pak ichsan), terbalik apa tdk, ternyata tdk ada masalah. Jadi cara utk mengatasi kurangnya CFM adalah menaikkan putaran operasi (karena CFM berbanding lurus dg putaran. Indikator amper rendah menunjukkan putaran fan belum mencukupi untuk menghasilkan CFM yg diinginkan
Rumus yg digunakan :

Daya (bhp) = V.I (voltase tetap), jadi daya (bhp) I (ampere), maka persamaannya menjadi :

Dari persamaan 1.3 kita hitung putaran fan yg dinginkan :
Data :
Putaran fan saat ini ( = 1450 rpm
Kuat arus saat ini = 12 A
Kuat arus dinginkan = 20 A
Pulley 1 (D1) = 8”
Pulley 2 (D2) = 8”

Maka putaran fan yg dinginkan :

rpm2 =
= 1450 (20/12)1/3
= 1719 rpm ~ 1720 rpm
Penggantian pulley (D2) =
D2 =
= (1450 x 8)/1720
= 6.74 7” atau 6” jika pulley 7” tdk ada.
Dari hasil perhitungan tersebut diaplikasikan ke lapangan penggantian pulley di fan jadi 6” (karena stokpulley 7" tdk ada digudang) dan di motor tetap 8”.
Hasilnya adalah : putaran fan 1900 rpm dan kuat arus 24 A, CFM meningkat, ditandai hisapan fan sudah terasa (kertas diletakkan di depan fan lengket, tdk jatuh).
Data moisture pun menunjukkan perbaikan rata2 moisture kernel berada dibawah 7.5 % (sudah masuk kedalam standar).

KESIMPULAN
Jika anda menemui masalah pada moisture kernel maka langkah yg harus dilakukan adalah :
1. Cek moisture nut kernel dari LTDS I dan sebelum masuk kernel tray drier atau kernel drier silo. Bandingkan perbedaan moisturenya, jika beda terlalu jauh 3-4% maka air dari hidrocyclone banyak terikut ke conveyor atau winower. Moisture yg baik sebelum masuk drier berkisar 17-18%.
2. Pastikan retention time cukup, untuk kernel tray drier biasanya +- 4 jam, untuk kernel drying silo +- 7 jam. Tapi ini tidak baku, tergantung kondisi masing2 pabrik.
3. Untuk kernel tray drier pastikan louvre tdk tersumbat, dan harus dicek minimal 1 kali sebulan
4. Pastikan CFM fan cukup dengan memperhatikan ampere motor utk fan (untuk phoenix fan SWSI 270, 20 HP amper operasi minimal 20A.
5. Pastikan ketebalan kernel +- 15 cm (hal ini tidak baku tergantung kondisi pabrik).

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